*     ************************************************************************

      subroutine sxndis(xstat)

*     ************************************************************************

*     Purpose :
*     ---------

*     This routine modifies the status XSTAT to correspond to the
*     status of a node that belongs to the subgraph used during
*     the minimization procedure.

*     The sith bit of the integer XSTAT is set to one.

*     Parameter :
*     -----------

*     xstat   ( int )

*       input  : the status of the considered node.
*       output : the updated status corresponds to the
*                status of a node that belongs to the
*                subgraph used during the minimization
*                procedure.

*     Routines used :
*     ---------------

*     None.

*     Programming :
*     -------------

*     D. Tuyttens

*     ========================================================================

*     Routine parameter

      integer  xstat

*     Internal variable

      integer  aux

      aux = xstat / 32
      if( mod(aux,2).eq.0 ) xstat = xstat + 32

      return
      end